Upgrading Glock18c AEP

[decoc182]

Just purchased an 18c off a friend of mine. Its a fantastic gun, and does not share the gremlins of the GBB pistols. However i wouldnt mind upgrading the pistol externally to have a metal slide, threaded barrel and some trademarks if possible.

Going off this review here :- http://www.airsoftretreat.com/forums...?topic=18843.0

they state there are some parts available, I was just wondering if any of you know if these parts are available in the UK at all ? Have any of you had any experience upgrading the 18c aep internally and externally?

regards